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- ;;; "getopt.scm" POSIX command argument processing
- ;Copyright (C) 1993, 1994 Aubrey Jaffer
- ;
- ;Permission to copy this software, to redistribute it, and to use it
- ;for any purpose is granted, subject to the following restrictions and
- ;understandings.
- ;
- ;1. Any copy made of this software must include this copyright notice
- ;in full.
- ;
- ;2. I have made no warrantee or representation that the operation of
- ;this software will be error-free, and I am under no obligation to
- ;provide any services, by way of maintenance, update, or otherwise.
- ;
- ;3. In conjunction with products arising from the use of this
- ;material, there shall be no use of my name in any advertising,
- ;promotional, or sales literature without prior written consent in
- ;each case.
-
- (define getopt:scan #f)
- (define getopt:char #\-)
- (define getopt:opt #f)
- (define *optind* 1)
- (define *optarg* 0)
-
- (define (getopt argc argv optstring)
- (let ((opts (string->list optstring))
- (place #f)
- (arg #f)
- (argref (lambda () ((if (vector? argv) vector-ref list-ref)
- argv *optind*))))
- (and
- (cond ((and getopt:scan (not (string=? "" getopt:scan))) #t)
- ((>= *optind* argc) #f)
- (else
- (set! arg (argref))
- (cond ((or (<= (string-length arg) 1)
- (not (char=? (string-ref arg 0) getopt:char)))
- #f)
- ((and (= (string-length arg) 2)
- (char=? (string-ref arg 1) getopt:char))
- (set! *optind* (+ *optind* 1))
- #f)
- (else
- (set! getopt:scan
- (substring arg 1 (string-length arg)))
- #t))))
- (begin
- (set! getopt:opt (string-ref getopt:scan 0))
- (set! getopt:scan
- (substring getopt:scan 1 (string-length getopt:scan)))
- (if (string=? "" getopt:scan) (set! *optind* (+ *optind* 1)))
- (set! place (member getopt:opt opts))
- (cond ((not place) #\?)
- ((or (null? (cdr place)) (not (char=? #\: (cadr place))))
- getopt:opt)
- ((not (string=? "" getopt:scan))
- (set! *optarg* getopt:scan)
- (set! *optind* (+ *optind* 1))
- (set! getopt:scan #f)
- getopt:opt)
- ((< *optind* argc)
- (set! *optarg* (argref))
- (set! *optind* (+ *optind* 1))
- getopt:opt)
- ((and (not (null? opts)) (char=? #\: (car opts))) #\:)
- (else #\?))))))
-